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English definition of “overnight”

overnight

adverb     /ˌəʊvəˈnaɪt/
for or during the night : I took a train overnight.
suddenly or quickly , and often unexpectedly : Building a project like this doesn't happen overnight. The company almost overnight reformed itself as a real estate developer . Major capital expenditure is rarely recouped overnight.
(Definition of overnight adverb from the Cambridge Business English Dictionary © Cambridge University Press)
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